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If your talking about your "engine heater", in general, seriously, it's to keep you from forgetting about it and driving off and damaging the heater and/or your AC outlet and/or having the extension cord trailing behind you.

Some oil heaters just have a heating element in the oil so it's just wasting electricity and WON'T make it warm up any faster if you leave it hooked up after you start it.

Some have a heater hooked inline with the coolant hose and may have an impeller driven by the AC power and when you start it up the extra pressure from the pump will over-speed the fan, when you unplug it the impeller will just run in neutral as it were. (I don't know if they still make those of not) Check your manual and it should give a reason.

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Q: Why do you have to unplug your diesel before starting it?
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